1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342584305393ef519b230ede04586633fc443c566109c55a479243ae5741b7cf. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67cb568b-e6f5-4b55-9b6d-7af45091787e.json and https://artists.proofprofile.net/proofs/artist/67cb568b-e6f5-4b55-9b6d-7af45091787e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c568dc30c71b195667003d1815d9dc0b55960194ff5c5cddf543a39634809bf. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2142495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad8764fc6433e5ed6f853a78fad559dc156fe57c29235600c5361e4e47c3dcb. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2226960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5496777f50ee6b278d85085f091ae1657ff808c486735c93f44ae28095a5cc. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2242641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35a159b1e3d0ecf1d778bb36a5d7eaea07badbabccfa8fd1fbdc1251f477a24. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2294650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62e2d2388dc6d46af9634dea0b6c62f77662a4e38f8cf53aa80fd1421469dd9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2214271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea874e36a0c79fe22572fbaf3230423c6e49d7a3f972694b05cb11cff69cd293. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2221409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbec9c465e8e365b3547213b054a8db9794a113e0c4a6cdc9bbc0085a650bd9f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMANG2218993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eba63af1d701193af8cb6967c0166c0da3da56c42f1a363562781deb806b83. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMANG2256890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bae3d8af141cf4b3b590f01dd47c9f82c1021c3b2d17b5256b7cb83568199b3. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742404454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10636e9791053e2c4c332ae4ec46d9541aacf069fea6944c8280fd8d8183e1c. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742405744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe125c5289494d55923f3a79311b566551bf2598f3b2f990ac717213f4708426b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742410614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1307f2fc6819294eb34c8ebd435dfb0f6104e19cceb12ac301d02597cb7bf4c1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742410686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd834616dc6f3b8404af76a80bebe20b48b16fd9c6ed80820738dceb085eed5. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:23:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742412548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbf4fd9e7a5febd525a1e953fa949f89aa5e8f721cebd6d8f74b06ba9dcf62a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2411584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504d2d3c0967fbb81f5dc8cc94b237e334cf53b4175071eef7133a87bc3e0a8d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2407875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff70200379faa736ffb6a7ec329a062835388b43d0cd575ad64145f58516436a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2417529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530b64d18555f7cc3e1843e07c1ce2371bf52f0bf16c26f4bb904c956db344a9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2528952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d96c4f7cd94a4c3f9a8eb3ed9fdf80a5912fe49b39aded20a4ffe5d575113d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USANG2518255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ec02f099a1a0dbfa7c97a7be554f780a038d895cd4b414c02d0055520c9ed4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2447703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd145e5a31f371d1151f9b1dc5110190d67a86b4eeb17e5cbf335a0a67d0cb1e0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2408325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182e1c27086d3e5ff71e4622b0c0c5db4f65752fdd86438063f33357adb064c4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2408346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cf586c425e86ed55d39125a3e942d677d6dc0716a412049154d3f022042f71. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2305344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0bed108660bb5ea070ddbfeda7ec1338b68546d27e0a417f774ec7446767c7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKZGC2305346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1092702cc0642713949642b2380229661743145b40537e2bc975c9ae4c9bdb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2546949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f01c269fcbc4fbecf2fac0a74f6e8f1e79928b42f470d4f96612c4d7cb2c2e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2481614.